Vertical speed sensor? (variometer?)

Does anyone know any module on the market that can measure the vertical speed? It is not nessecary for me to have absolute altitude measuring but only to know if the heli is going up or down and how fast. The sensor i m looking for must give measurement at low speeds like 10centimeters/second. If i just know this data i can hover the heli and when i want to land i would go slowly down until i ll get signal from the ultrasonic sensor. If flying high i ll have the altitude by the GPS and just avoiding climb or descent so fast (by the GPS errors) , with such a sensor.

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Hi friends some news abaut vario on 3dr?Ì use from long time this autopilot for make fpv long range and i ask if is possibile use audio input for trasmit to the ground one variometer signal
  • A resolution of 0.1 knot is impressive Marc.  Can you describe the specialized code you use to pull the signal from the noise?

    • Jeff, did you notice this thread is nearly 6 years old?  

      By "specialized" I meant specific to the implementation of a variometer.  In our case, using the microcontroller onboard ADCs and digital filters, combined with simple linear boxcar filtering in the code was good enough to achieve that level of resolution on a desktop.  In a glider we use the variometer in conjunction with a total energy compensator, which mixes altitude with airspeed to calculate total energy altitude, either before the variometer pressure sensor sees it (using a pneumatic compensating probe), or in the variometer code (using airspeed sensor data).  When in turbulent air, a glider encounters horizontal gusts, causing transient fluctuations in airspeed which, in turn, show up as (sometimes large) fluctuations in variometer reading.  This was addressed by implementing a "gust filter" as the final step in the variometer code.  We tried a variety of filter implementations, but simply rate limiting the change in variometer indication was sufficient to damp down the transients, while not interfering with the all important task of finding rising air.

  • What you're looking for is called a "variometer", which is a sensitive vertical speed indicator. There are miniature ones intended for use in R/C sailplanes, but these typically transmit an audio tone to a ground based receiver, so they would require some adaptation if you want to use the signal on-board the helicopter.

    I've able to measure vertical speed down to a resolution of less than 0.1 knot (5 cm/sec) using an absolute pressure sensor, 24 bit A/D converter (needs about 18 to 19 bits effective resolution), and digital differentiation, but it takes a lot of specialized code to separate the signal from the noise...
  • 3D Robotics
    I can't think of any. The usual speed sensors (pitot tubes) won't work in the vertical dimension on a heli because of propwash. I think this is something you'll have to derive by integrating your static altitude measurements over time.
This reply was deleted.

Activity

DIY Robocars via Twitter
May 15
DIY Robocars via Twitter
May 14
DIY Robocars via Twitter
May 13
DIY Robocars via Twitter
RT @f1tenth: Say hi to our newest #F1TENTH creation for @ieee_ras_icra next week in Philly. It’s going to be huge! 😎 🔥 @AutowareFdn @PennEn…
May 13
DIY Robocars via Twitter
May 11
DIY Robocars via Twitter
May 8
DIY Robocars via Twitter
RT @SmallpixelCar: Noticed my car zigzagged in last run. It turned out to be the grass stuck in the wheel and made the odometry less accura…
May 8
DIY Robocars via Twitter
RT @SmallpixelCar: Test my car. RTK GPS worked great. Thanks @emlid for their support. https://t.co/EkQ6qmjmWR
May 8
DIY Drones via Twitter
RT @chr1sa: @kane That's @diydrones circa 2009. Still have a box of those Canon cameras that we used to strap into planes, just like this.…
May 3
DIY Robocars via Twitter
RT @chr1sa: Our next @diyrobocars race is going to be outside at a real RC racetrack in Fremont on May 28. Fully autonomous racing, head-to…
Apr 30
DIY Robocars via Twitter
RT @f1tenth: Our Spring 2022 F1TENTH course @PennEngineers is coming to an end with a head-to-head race as a big finale. So proud of our st…
Apr 26
DIY Robocars via Twitter
RT @DanielChiaJH: I wrote a thing! Throughout the development of my @diyrobocars car I've been using @foxglovedev Studio to visualize and d…
Apr 23
DIY Robocars via Twitter
RT @SmallpixelCar: My new car for high speed. Low body, everything ( @NVIDIAEmbedded Jetson Xavier NX, @emlid RTK GPS, IMC) under the deck…
Apr 23
DIY Robocars via Twitter
Apr 21
DIY Robocars via Twitter
RT @f1tenth: F1TENTH Race training setup @PennEngineers for our upcoming ICRA2022 @ieee_ras_icra competition. @OpenRoboticsOrg @IndyAChalle…
Apr 21
DIY Robocars via Twitter
RT @fatcatFABLAB: Proud to be hosting a restarted DIY Robocars NYC Meetup April 26. Come by if you want to talk about and race self-driving…
Apr 17
More…